/Engine/Source/Editor/BlueprintGraph/Classes/EdGraphSchema_K2.h
Sets the autogenerated default value for a pin, optionally using the passed in function and parameter. This will also reset the current default value to the autogenerated one
virtual void SetPinAutogeneratedDefaultValue ( [UEdGraphPin](API\Runtime\Engine\EdGraph\UEdGraphPin) * Pin, const [FString](API\Runtime\Core\Containers\FString) & NewValue ) const